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13 Feb 2006, 21:43
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What is the value of the integer x?
(1) x(x + 2) = 15
(2) (x + 2)^x = 125
(1) x(x + 2) = 15
(2) (x + 2)^x = 125
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13 Feb 2006, 21:46
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(1) x^2 + 2x - 15 = 0 -> x = -5, 3.
Insufficient as we have 2 solutions
(2) Sufficient as we can write 125 as (3+2)^3 <=> (x+2)^x giving as x = 3.
Ans B
Insufficient as we have 2 solutions
(2) Sufficient as we can write 125 as (3+2)^3 <=> (x+2)^x giving as x = 3.
Ans B
